基于偶氮苯衍生物的三阶非线性光开关性能的调控

doi:10.6023/A19120427

化学学报 ›› 2020, Vol. 78 ›› Issue (3): 256-262.DOI: 10.6023/A19120427 上一篇下一篇

研究论文

基于偶氮苯衍生物的三阶非线性光开关性能的调控

翟亚丽, 许文娟, 孟祥茹, 侯红卫

郑州大学化学学院郑州 450001

投稿日期:2019-12-16 发布日期:2020-03-06
通讯作者: 孟祥茹, 侯红卫 E-mail:mxr@zzu.edu.cn;houhongw@zzu.edu.cn
基金资助:
项目受国家自然科学基金（21671174）、中原千人计划和河南省自然科学基金（182300410008）资助.

Adjusting the Third-Order Nonlinear Optical Switch Performance Based on Azobenzene Derivatives

Zhai Yali, Xu Wenjuan, Meng Xiangru, Hou Hongwei

College of Chemistry, Zhengzhou University, Zhengzhou 450001

Received:2019-12-16 Published:2020-03-06
Supported by:
Project supported by the National Natural Science Foundation of China (No. 21671174), the Zhongyuan Thousand Talents Project and the Natural Science Foundation of Henan Province (No. 182300410008).

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摘要/Abstract

偶氮苯衍生物因其具有特殊的共轭体系常用作光开关特性的三阶非线性光学（NLO）开关材料，但有部分带有特殊基团的偶氮类分子在一般条件下无法显示其性能.然而，这类分子在被调节之后能展示出优异的光控的NLO开关性能.以无光控的NLO开关性能的5-（N-4-偶氮苯基）氨甲基间苯二甲酸为研究对象，并对其潜在的光控NLO开关性能进行调控.经过调节后的这类分子在光照条件下能顺利地经历可逆的顺反异构化反应，且产生三阶非线性性能的转换.其Z-扫描实验结果显示处于反式构型的材料展示出反饱和吸收和自散焦特性；在光照之后，这类材料转化为顺式构型并展现出饱和吸收和自聚焦行为.三阶NLO性能的转换是由于材料的结构发生转变其内部电子产生重排，使得它们在激光刺激下产生不同的响应机制.

关键词: 顺反异构, 光控的, 三阶NLO开关, 质子效应, 性能转变

The photo-controllable third-order nonlinear optical (NLO) switches have drawn ever-increasing attention due to considerable research potential in the emerging field of nonlinear optics. A class of materials, which contain photosensitive groups but cannot express directly switching properties under light conditions, can also exhibit the characteristics of excellent photo-controllable NLO switches after external regulation. Azobenzene is a kind of classic photo-isomerized molecule and has good π coplanar property and excellent electron channel, which can engender third-order NLO response under push and pull electron action. It is a feasible strategy to design photo-controlled NLO switch materials by introducing azo groups. Nevertheless, the trans-cis isomerization behaviors of some azobenzene derivatives are interfered by other groups or external factors, further inhibiting the conversion of photo-controllable third-order NLO properties. Once these external interference factors are found and removed, the photo-controllable NLO behaviors of such azobenzene derivatives will be opened. In our work, a special azobenzene derivative was synthesized and reported, which was unable to produce cis-trans isomerization due to the H⁺ effect of self-dissociation, and the H⁺ effect could be shield by introducing organic groups or bases. The adjusted materials can easily undergo reversible cis-trans isomerization reaction, and the Z-scan test shows the complete inversions of third-order NLO properties before and after UV irradiation. The adjusted materials in trans configuration show the reverse saturation absorption (RSA) and self-defocusing properties. After UV irradiation, the materials convert into cis configuration and exhibit saturation absorption (SA) and strong self-focusing behaviors. To gain a deeper understanding of the light-adjusted third-order NLO switch behaviors, density functional theory (DFT) calculations of (CH₃)₂L were carried out. For trans-(CH₃)₂L, HOMO and LUMO are mainly localized on the azobenzene unit, where π-π^* transition between the two orbitals is displayed. The azobenzene unit in the trans-(CH₃)₂L is considered to have considerable contribution to the generation of third-order nonlinear-ity. For cis-(CH₃)₂L, the electron cloud density of HOMO is mainly populated on the azobenzene unit, whereas the electron cloud density distribution of LUMO appears on the entire molecule, suggesting significant intramolecular charge transfer (ICT) from azobenzene to the entire molecule. The effect of ICT in the cis structure dominants the generation of third-order nonlinearity. The remarkable third-order NLO transformation result from the rearrangement of the electronic structures, which makes them generate different response mechanisms under the laser stimulation.

Key words: cis-trans isomerization, photo-controllable, third-order NLO switch, protons effect, performance transformation

引用此文

翟亚丽, 许文娟, 孟祥茹, 侯红卫. 基于偶氮苯衍生物的三阶非线性光开关性能的调控[J]. 化学学报, 2020, 78(3): 256-262.

Zhai Yali, Xu Wenjuan, Meng Xiangru, Hou Hongwei. Adjusting the Third-Order Nonlinear Optical Switch Performance Based on Azobenzene Derivatives[J]. Acta Chimica Sinica, 2020, 78(3): 256-262.

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基于偶氮苯衍生物的三阶非线性光开关性能的调控

Adjusting the Third-Order Nonlinear Optical Switch Performance Based on Azobenzene Derivatives

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